#!/usr/bin/env python
"""
Pure Trace Analysis Functions

This module provides pure functions for analyzing trace content characteristics
without any database dependencies. These functions can be used independently
or by the backend services for trace management.
"""

import re
import logging
from typing import Dict, Any, Tuple

logger = logging.getLogger(__name__)


def analyze_trace_characteristics(
    trace_content: str,
    optimize_content: bool = True
) -> Dict[str, Any]:
    """
    Analyze the trace content to determine its characteristics and optimal parameters 
    for sliding window processing.
    
    Args:
        trace_content: The full content of the trace
        optimize_content: Whether to apply content optimization for cost savings
        
    Returns:
        Dictionary with trace characteristics and recommended parameters
    """
    logger.info("Analyzing trace characteristics...")
    
    # Apply content optimization if requested
    optimization_stats = None
    if optimize_content:
        logger.info("Applying content optimization for cost savings...")
        trace_content, optimization_stats = preprocess_content_for_cost_optimization(trace_content, aggressive=True)
    
    # Calculate basic content metrics (on optimized content)
    total_length = len(trace_content)
    lines = trace_content.split('\n')
    line_count = len(lines)
    
    # Calculate average line length
    avg_line_length = sum(len(line) for line in lines) / max(1, line_count)
    
    # Check for code density (common programming keywords and syntax)
    code_pattern = r'function|class|def|return|import|export|const|var|let|async|await|if|else|for|while'
    code_matches = len(re.findall(code_pattern, trace_content))
    code_density = code_matches / max(1, total_length/100)  # Normalize per 100 chars
    
    # Check for structured data (JSON, XML, etc.)
    struct_pattern = r'[{}\[\],":]+|<\/?[a-z]+>|<\/[a-z]+>'
    struct_matches = len(re.findall(struct_pattern, trace_content))
    struct_density = struct_matches / max(1, total_length/100)  # Normalize per 100 chars
    
    # Calculate entity patterns (camelCase, PascalCase, snake_case identifiers)
    entity_pattern = r'\b[A-Z][a-z]+[A-Z][a-zA-Z]*\b|\b[a-z]+_[a-z_]+\b|\b[a-z]+[A-Z][a-zA-Z]*\b'
    entity_matches = len(re.findall(entity_pattern, trace_content))
    entity_density = entity_matches / max(1, total_length/100)  # Normalize per 100 chars
    
    # Check for complete interaction patterns - IMPROVED PATTERN
    # Look for full interaction blocks with system/user/assistant messages
    interaction_sizes = []
    conversation_turn_count = 0
    
    # Try to identify input/output blocks in JSON format
    input_output_pattern = r'"input":.*?"output":'
    io_blocks = re.findall(input_output_pattern, trace_content, re.DOTALL)
    if io_blocks:
        for block in io_blocks:
            interaction_sizes.append(len(block))
        avg_interaction_size = sum(interaction_sizes) / len(interaction_sizes) if interaction_sizes else 0
        logger.info(f"Found {len(io_blocks)} input/output blocks with average size of {avg_interaction_size:.0f} characters")
    
    # If we couldn't find structured blocks, try to find conversation turns
    if not interaction_sizes:
        conversation_pattern = r'(user:|assistant:|system:).*?(user:|assistant:|system:|\Z)'
        conversation_blocks = re.findall(conversation_pattern, trace_content, re.DOTALL)
        if conversation_blocks:
            for block in conversation_blocks:
                # The full match is in the first element
                full_text = block[0] if isinstance(block, tuple) else block
                interaction_sizes.append(len(full_text))
            avg_interaction_size = sum(interaction_sizes) / len(interaction_sizes) if interaction_sizes else 0
            conversation_turn_count = len(conversation_blocks)
            logger.info(f"Found {len(conversation_blocks)} conversation blocks with average size of {avg_interaction_size:.0f} characters")
    
    # Count patterns for conversation analysis
    human_turns = len(re.findall(r'\buser:', trace_content, re.IGNORECASE))
    ai_turns = len(re.findall(r'\bassistant:', trace_content, re.IGNORECASE))
    system_messages = len(re.findall(r'\bsystem:', trace_content, re.IGNORECASE))
    
    # Base parameters (ultra-aggressive optimization for 1M token limit)
    base_window = 350000  # Increased from 200K to 350K characters (~87K tokens)
    base_overlap_ratio = 0.05  # Reduced from 12.5% to 5% overlap (ultra-minimal)
    
    # Adjust window size based on content characteristics
    if interaction_sizes:
        # Calculate max interaction size to ensure we capture full interactions
        max_interaction_size = max(interaction_sizes)
        # Use at least 2x the max interaction size to ensure complete interactions
        window_size = max(base_window, int(max_interaction_size * 2))
        logger.info(f"Adjusting window size based on max interaction size ({max_interaction_size} chars): {window_size}")
        overlap_ratio = 0.08  # 8% overlap to ensure we don't split interactions (still very minimal)
    elif struct_density > 0.5:
        # High structured data density (JSON, XML) - use maximum windows
        window_size = 400000  # Use maximum window size
        overlap_ratio = 0.03  # 3% overlap for structured data (minimal)
        trace_type = "structured_data"
    elif code_density > 0.5:
        # High code density - use maximum windows to capture entire modules
        window_size = 400000  # Use maximum window size
        overlap_ratio = 0.05  # 5% overlap for code (minimal)
        trace_type = "code"
    elif entity_density > 0.5:
        # High entity density - use very large windows with minimal overlap
        window_size = int(base_window * 1.14)  # ~400K window size
        overlap_ratio = 0.05  # 5% overlap for entity relationships
        trace_type = "entity_rich"
    elif avg_line_length > 150:
        # Very long lines (likely logs) - use maximum window size with minimal overlap
        window_size = 400000  # Maximum window size
        overlap_ratio = 0.03  # 3% overlap for logs (very minimal)
        trace_type = "log"
    elif avg_line_length < 50:
        # Short lines (conversation logs) - still use very large windows
        window_size = int(base_window * 1.14)  # ~400K window size
        overlap_ratio = 0.08  # 8% overlap for context (still minimal)
        trace_type = "conversation"
    else:
        # Default case - use base parameters
        window_size = base_window
        overlap_ratio = base_overlap_ratio
        trace_type = "general"
    
    # Ultra-aggressive scaling for large documents
    if total_length > 800000:
        # Very large document - force to maximum window size
        window_size = 400000  # Maximum possible
        overlap_ratio = 0.03  # Minimal overlap
        logger.info(f"Ultra-large document detected ({total_length:,} chars): using maximum window size with minimal overlap")
    elif total_length > 400000:
        # Large document - use near-maximum window sizes
        window_size = min(400000, int(total_length * 0.6))  # 60% of total length or max
        overlap_ratio = 0.04  # Very minimal overlap
        logger.info(f"Large document detected ({total_length:,} chars): using near-maximum window size")
    elif total_length > 200000:
        # Medium-large document - use large windows
        window_size = min(400000, int(total_length * 0.8))  # 80% of total length or max
        overlap_ratio = 0.05  # Minimal overlap
    
    # Calculate overlap size from ratio
    overlap_size = int(window_size * overlap_ratio)
    
    # Ultra-aggressive constraints - push to absolute limits
    window_size = max(100000, min(400000, window_size))  # Between 100K-400K chars (25K-100K tokens)
    overlap_size = max(2000, min(20000, overlap_size))    # Between 2K-20K chars (minimal overlap)
    
    # Estimate number of windows needed
    estimated_windows = max(1, int((total_length - overlap_size) / (window_size - overlap_size) + 1))
    
    # Determine trace type if it wasn't set above
    if 'trace_type' not in locals():
        if human_turns > 0 and ai_turns > 0:
            trace_type = "conversation"
        elif code_density > 0.2:
            trace_type = "code"
        elif struct_density > 0.2:
            trace_type = "structured_data"
        else:
            trace_type = "general"
    
    # Return comprehensive trace analysis
    return {
        "total_length": total_length,
        "line_count": line_count,
        "avg_line_length": round(avg_line_length, 1),
        "code_density": round(code_density, 2),
        "struct_density": round(struct_density, 2),
        "entity_density": round(entity_density, 2),
        "interaction_count": len(interaction_sizes) if interaction_sizes else conversation_turn_count,
        "avg_interaction_size": round(sum(interaction_sizes) / len(interaction_sizes), 1) if interaction_sizes else 0,
        "human_turns": human_turns,
        "ai_turns": ai_turns,
        "system_messages": system_messages,
        "trace_type": trace_type,
        "recommended_window_size": window_size,
        "recommended_overlap_size": overlap_size,
        "estimated_windows": estimated_windows,
        "processing_complexity": "high" if estimated_windows > 10 else "medium" if estimated_windows > 3 else "low",
        "optimization_stats": optimization_stats
    }


def display_trace_summary(analysis: Dict[str, Any]) -> None:
    """
    Display a formatted summary of trace characteristics to the user.
    
    Args:
        analysis: Dictionary containing trace analysis data
    """
    print("\n" + "=" * 80)
    print(f"TRACE ANALYSIS SUMMARY")
    print("=" * 80)
    
    # Basic statistics
    print(f"\nBASIC STATISTICS:")
    print(f"  Total length: {analysis['total_length']:,} characters")
    print(f"  Line count: {analysis['line_count']:,} lines")
    print(f"  Average line length: {analysis['avg_line_length']:.1f} characters")
    
    # Content type
    print(f"\nCONTENT CHARACTERISTICS:")
    print(f"  Detected trace type: {analysis['trace_type'].replace('_', ' ').title()}")
    
    if analysis['trace_type'] == 'conversation':
        print(f"  Conversation turns: {analysis['interaction_count']} ")
        print(f"    - Human messages: {analysis['human_turns']}")
        print(f"    - AI messages: {analysis['ai_turns']}")
        print(f"    - System messages: {analysis['system_messages']}")
        if analysis['avg_interaction_size'] > 0:
            print(f"  Average message size: {analysis['avg_interaction_size']:.1f} characters")
    
    print(f"  Content density metrics:")
    print(f"    - Code density: {analysis['code_density']:.2f}")
    print(f"    - Structured data density: {analysis['struct_density']:.2f}")
    print(f"    - Entity density: {analysis['entity_density']:.2f}")
    
    # Processing recommendations
    print(f"\nPROCESSING RECOMMENDATIONS:")
    print(f"  Recommended window size: {analysis['recommended_window_size']:,} characters")
    print(f"  Recommended overlap size: {analysis['recommended_overlap_size']:,} characters")
    print(f"  Estimated number of windows: {analysis['estimated_windows']}")
    print(f"  Processing complexity: {analysis['processing_complexity'].title()}")
    
    # Processing time estimate
    base_time_per_window = 15  # seconds per window baseline
    if analysis['processing_complexity'] == 'high':
        time_factor = 1.5
    elif analysis['processing_complexity'] == 'medium':
        time_factor = 1.0
    else:
        time_factor = 0.8
        
    estimated_time = base_time_per_window * analysis['estimated_windows'] * time_factor
    minutes = int(estimated_time / 60)
    seconds = int(estimated_time % 60)
    
    print(f"  Estimated processing time: ~{minutes}m {seconds}s")
    print("\n" + "=" * 80)


def preprocess_content_for_cost_optimization(content: str, aggressive: bool = True) -> Tuple[str, Dict[str, Any]]:
    """
    Preprocess content to reduce character count while preserving semantic meaning.
    This can significantly reduce API costs by removing redundant data.
    
    Args:
        content: Original content
        aggressive: Whether to apply aggressive optimization
        
    Returns:
        Tuple of (optimized_content, optimization_stats)
    """
    original_length = len(content)
    
    # Start with basic optimizations
    optimized = content
    
    # Remove excessive whitespace and normalize line endings
    optimized = re.sub(r'\n\s*\n\s*\n+', '\n\n', optimized)  # Convert 3+ newlines to 2
    optimized = re.sub(r'[ \t]+', ' ', optimized)  # Multiple spaces/tabs to single space
    optimized = re.sub(r' +\n', '\n', optimized)  # Remove trailing spaces
    
    if aggressive:
        # More aggressive optimizations that may slightly reduce semantic richness
        # but significantly reduce costs
        
        # Remove debug/verbose logging patterns
        optimized = re.sub(r'DEBUG:.*?\n', '', optimized)
        optimized = re.sub(r'TRACE:.*?\n', '', optimized)
        optimized = re.sub(r'\[DEBUG\].*?\n', '', optimized)
        
        # Remove timestamp patterns (keep date for context)
        optimized = re.sub(r'\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d{3,6}', '', optimized)
        optimized = re.sub(r'\d{2}:\d{2}:\d{2}\.\d{3,6}', '', optimized)
        
        # Remove excessive JSON indentation while preserving structure
        optimized = re.sub(r'\n {8,}', '\n    ', optimized)  # Reduce deep indentation
        
        # Remove empty JSON objects/arrays that add no semantic value
        optimized = re.sub(r'{\s*}', '{}', optimized)
        optimized = re.sub(r'\[\s*\]', '[]', optimized)
        
        # Normalize repeated patterns (like multiple "---" separators)
        optimized = re.sub(r'-{5,}', '-----', optimized)
        optimized = re.sub(r'={5,}', '=====', optimized)
        
        # Remove excessive blank lines in code/JSON blocks
        optimized = re.sub(r'(\{[^}]*)\n\n+([^}]*\})', r'\1\n\2', optimized)
    
    # Final cleanup
    optimized = optimized.strip()
    
    # Calculate statistics
    final_length = len(optimized)
    reduction = original_length - final_length
    reduction_percentage = (reduction / original_length) * 100 if original_length > 0 else 0
    
    stats = {
        "original_length": original_length,
        "optimized_length": final_length,
        "characters_removed": reduction,
        "reduction_percentage": round(reduction_percentage, 2),
        "aggressive_mode": aggressive
    }
    
    logger.info(f"Content optimization complete: {reduction:,} characters removed ({reduction_percentage:.1f}% reduction)")
    
    return optimized, stats